Where did Lazarus go at death for four days? Did he go to Heaven or did he remain in the grave asleep?

He was asleep in death as Jesus said he was. John 11:11 "Lazarus our friend has gone to rest, but I am journeying there to awaken him from sleep." vs 14 "Lazarus has died." As far as decomposing, Martha was concerned that he may smell, but Jesus was not concerned he said vs 40 "Did I not tell you that if you would believe you would see the glory of God?" If Jesus could resurrect him, he could heal any decomposing. Plus, they prepared the body and wrapped it from head to toe and put it in a tomb. I've seen real life mummies in person that are 1000's of years old and they still have skin and hair. You can actually tell what they looked like. It's amazing. So for Jesus it was not impossible and it was a miracle to bring Lazarus back to life. What's interesting there is no record that Lazarus said he went to heaven, that he saw a bright light etc... but as Ecc 9:5 states "the dead are conscious of nothing".